This is a Sturmey Archer SX-RK3 3-speed 170mm Disc Rear Hub.
- FatBike compatible, internal gear 3-speed freewheel hub for use with any IS 6-bolt disc brake
- 6061 aluminum hub shell with 13/32" slotted solid axle (215mm overall axle length)
- Gear ratio range of 177% (33% each step)
- Includes 3-spline 18 tooth cog and a TSS33 twist shifter
Axle: 13/32"x170mm nutted